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Biomedical Optics & Medical Imaging

Paul Selvin Hot Topics presentation: New Small Quantum Dots for Neuroscience

Presented at SPIE Photonics West 2014

4 March 2014, SPIE Newsroom. DOI: 10.1117/2.3201403.17

Paul Selvin, Univ. of Illinois at Urbana-Champaign (USA)In "New Small Quantum Dots for Neuroscience," Paul Selvin (University of Illinois, Urbana-Champaign) notes how the details of synapsis activity in the brain involves chemical receptors that facilitate the creation of the electrical connection between two nerves.  In order to understand the details of this neuroscience phenomenon you need to be able to "see" what is happening at the scale of these receptors, which is around 10 nanometers. This is smaller than the diffraction limit of normal microscopy and it takes place on a 3 dimensional structure.

Selvin describes the development of small quantum dots (on the order of 6-9 microns) that are surface-sensitized to interact with the receptors. This allows the application of photo-activated localized microscopy (PALM), a superresolution microscopy that can be scanned through focus to develop a 3D map on a scale that is the same size as the emitter, which in this case are the small quantum dots. The quantum dots are stable in time and provide access to the receptors which allows the imaging of the interactions taking place at the synoptic level.

Paul Selvin earned a PhD in physics from the University of California, Berkeley, in 1990. He is currently a professor of physics and biophysics at University of Illinois, Urbana-Champaign (USA).